CN102760113A - RS232 interface circuit with hotplug support - Google Patents
RS232 interface circuit with hotplug support Download PDFInfo
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Abstract
The invention discloses a RS232 (Recommend Standard 232) interface circuit with hotplug support, which comprises a power isolating circuit and a data signal isolating circuit, wherein a current limiting load switch used for controlling a surge current is arranged in the power isolating circuit; the data signal isolating circuit comprises a first optical coupler, a second optical coupler and a triode; data sending signals RXD232 (Receive Data232) are input to the first optical coupler through a first buffer protection circuit; data sending signals UART0OUT (Universal Asynchronous Receiver Transmitter 0OUT) are input in the second optical coupler; output signals of the second optical coupler are connected with a base electrode of the triode through a pull-up resistor; an emitting electrode of the triode is connected with P9V output by the power isolating circuit; and N9V output by the power isolating circuit is connected with a collector electrode of the triode through a pull-down shunt resistance circuit. In the RS232 interface circuit with hotplug support, the current limiting load switch is switched off automatically if the current in a RS232 interface exceeds the set threshold value, and a first protection circuit and a second protection circuit can suppress overvoltage, so that the RS232 interface circuit achieves the function of hotplug support.
Description
Technical field
The present invention relates to the RS232 interface, be specifically related to support hot-swappable RS232 interface circuit.
Background technology
The RS232 interface is a kind of standard configuration interface that various departments of computer science unify and often use in the embedded system, and the RS232 interface of standard itself is not supported hot-swappable.But, easy to operate in perhaps use for engineering some application scenario, require it to support hot-swappable function, and, from the consideration of reliability and security, require the isolation fully of support of RS232 interface and system equipment.
At present, though there is production firm of a few family few in number that the RS232 interface solution of isolated form can be provided, do not possess and support hot-swappable function.
Summary of the invention
Technical matters to be solved by this invention is to solve the RS232 interface how to support hot-swappable problem.
In order to solve the problems of the technologies described above, the technical scheme that the present invention adopted provides a kind of hot-swappable RS232 interface circuit of supporting, comprises power isolation circuit and data-signal buffer circuit; Said power isolation circuit comprises current limiting load switch, former limit transformer H bridge driver, transformer and current rectifying and wave filtering circuit; Power supply is input to former limit transformer H bridge driver after the current limiting load switch current limliting; Said former limit transformer H bridge driver driving transformer boost into the corresponding alternating voltage of RS232 interface level, by the current rectifying and wave filtering circuit rectification be then and the output of the corresponding P9V of RS232 interface level and N9V direct voltage source; Said data-signal buffer circuit comprises first optocoupler, second optocoupler and triode; The data of RS232 interface end are sent signal RXD232 and are input to first optocoupler through the first buffer protection circuit, and first optocoupler output UART0IN signal is to universal asynchronous reception/transmit control device; The data of universal asynchronous reception/transmit control device are sent signal UART0OUT and are input to second optocoupler; The output signal of second optocoupler is connected to the base stage of triode through pull-up resistor; The emitter of triode meets the P9V of power isolation circuit output; The N9V of power isolation circuit output is connected to the collector of triode through drop-down shunt resistance circuit, exports the RS232 interface from the data reception signal TXD232 of the RS232 interface end of the collector output of triode to through the second buffer protection circuit.
In such scheme; The said first buffer protection circuit comprises the first safety electric capacity, a TVS diode, first inductance and first diode; Be connected with first diode with first inductance successively after first electric capacity and the TVS diode parallel connection; First diode, two current-limiting resistances of connecting successively are connected to the P pin of first optocoupler, and the N pin of first optocoupler connects the output terminal of first diode through second diode; The said second buffer protection circuit comprises the second safety electric capacity, the 2nd TVS diode and second inductance, is connected with second inductance after second electric capacity and the 2nd TVS diode parallel connection, and second inductance is connected with the collector of triode.
In such scheme, said drop-down shunt resistance circuit is composed in parallel by first, second drop-down shunt resistance.
In such scheme; The input voltage of said power isolation circuit is direct current 5V; The model of current limiting load switch is TPS22941DCKR; The model of former limit transformer H bridge driver is MAX253CSA+, and the Vin pin of current limiting load switch is connected with said input voltage, and the Vout pin connects the VCC pin of former limit transformer H bridge driver and the center tap of transformer TR1; The input end of transformer TR1 primary coil connects D1, the D2 pin of former limit transformer H bridge driver respectively, the output termination current rectifying and wave filtering circuit of the secondary coil of transformer TR1.
In such scheme; The input voltage of said power isolation circuit is direct current 3.3V; The model of current limiting load switch is TPS22941DCKR; The model of former limit transformer H bridge driver is MAX253CSA+; The Vin pin of current limiting load switch is connected with said input voltage, and the Vout pin connects the VCC pin of former limit transformer H bridge driver and the center tap of transformer TR1, and the input end of transformer TR1 primary coil connects D1, the D2 pin of former limit transformer H bridge driver respectively; The output termination current rectifying and wave filtering circuit of the secondary coil of transformer TR1, two input ends of transformer respectively through a diode be connected to former limit transformer H bridge driver the VCC pin.
In such scheme, the public output of two said diodes is through a filter capacitor ground connection.
The present invention is provided with current limiting load switch to suppress surge current at the power input of RS232 interface circuit, if RS232 interface electric current present has surpassed preset threshold, then current limiting load switch automatically shuts down; In external interface one side, the inductance and the safety electric capacity of the certain equiva lent impedance of TVS pipe parallel-series is set, thus the possibility of effectively clamping down on the over-voltage breakdown circuit, thus realized the hot-swappable function of RS232 interface circuit support.
Description of drawings
Fig. 1 is the circuit diagram of 5V power isolation circuit in the hot-swappable RS232 interface circuit of support provided by the invention;
Fig. 2 is the circuit diagram of 3.3V power isolation circuit in the hot-swappable RS232 interface circuit of support provided by the invention;
Fig. 3 is the circuit diagram of data-signal buffer circuit in the hot-swappable RS232 interface circuit of support provided by the invention;
In the foregoing circuit, G be the public ground of the UART circuit before isolating, G be the public ground that isolates back RS232 interface circuit.
Embodiment
When hot-swappable RS232 interface circuit is supported in design, mainly need to consider the destruction of the interface circuit that possibly bring to the destruction of signal end overvoltage pulse with from the surge current of power supply.For this reason, the present invention is provided with current limiting load switch to suppress surge current at power input, if RS232 interface electric current present has surpassed preset threshold, then current limiting load switch automatically shuts down; Overvoltage to signal end is impacted, and the measure that the present invention adopts is in external interface one side, and the inductance and the safety electric capacity of the certain equiva lent impedance of TVS pipe parallel-series is set, thus the possibility of effectively clamping down on the over-voltage breakdown circuit.Below in conjunction with Figure of description and embodiment the present invention is made detailed explanation.
The hot-swappable RS232 interface circuit of support provided by the invention comprises power isolation circuit and data-signal buffer circuit, and the input voltage of power isolation circuit can be direct current 5V, also can be direct current 3.3V.
At first the circuit diagram of 5V power isolation circuit shown in Figure 1 is described below, this circuit comprises current limiting load switch IC1, former limit transformer H bridge driver IC2, transformer TR1 and current rectifying and wave filtering circuit.The 5V DC input voitage is input to former limit transformer H bridge driver IC2 after current limiting load switch IC1 current limliting; And driving transformer TR1 boost into the corresponding 12V alternating voltage of RS232 interface level, then by the current rectifying and wave filtering circuit rectification be with the RS232 interface level corresponding ± output of 12V direct voltage source.
Referring to Fig. 1, the model of current limiting load switch IC1 is TPS22941DCKR again, and the model of former limit transformer H bridge driver IC2 is MAX253CSA+.The Vin pin of IC1 is connected with the 5V DC input voitage, and power end safety capacitor C 1 of this 5V DC input voitage parallel connection, utilizes power end safety capacitor C 1 can avoid shocking by electricity and jeopardizing personal safety.Also be connected to the 5V DC input voitage after overcurrent resistance R 1 of OC pin series connection of IC1; The ON pin of IC1 and GND pin ground connection; The Vout pin of IC1 connects the VCC pin of former limit transformer H bridge driver IC2 and the center tap of transformer TR1 respectively, the GND of IC2 and SD pin ground connection, ground connection behind the FS pin serial connection frequency conversion resistor R5 of IC2; The input end of transformer TR1 primary coil connects D1, the D2 pin of IC2 respectively, the output termination current rectifying and wave filtering circuit of transformer TR1 secondary coil.Current rectifying and wave filtering circuit is made up of four diode D5～D8 and four capacitor C 6～C9, and this current rectifying and wave filtering circuit is the conventional design of this area, repeats no more at this.
Current limiting load switch IC1 is an over-current protection device; During the RS232 hot plugging of interface, if too big surge current is arranged, then this current limiting load switch IC1 can automatically shut down; Prevent to burn out circuit by insulation blocking; Also through capacitor C 4 ground connection, also through capacitor C 5 ground connection, capacitor C 4, C5 play the filtering protective effect on the VCC pin of former limit transformer H bridge driver IC2 on the Vout pin of current limiting load switch IC1.
Former limit transformer H bridge driver IC2 is converted into the 5V direct voltage source of current limiting load switch IC1 output the alternating impulse driving transformer TR1 of certain frequency; Output terminal at transformer TR1 obtains a direct voltage source after the isolation through current rectifying and wave filtering circuit, and the amplitude of this direct voltage source can be according to the turn ratio different adjustment size of transformer TR1.For input power supply as shown in Figure 1 is the circuit of 5V, and the turn ratio of transformer TR1 is 1: 2.1, thereby the 5V boost in voltage is obtained the datum of a suitable RS232 interface level logic, just P9V among Fig. 1 and N9V.
Fig. 2 is the circuit diagram of 3.3V power isolation circuit; Different with 5V power isolation circuit shown in Figure 1 is; The input voltage of this circuit is direct current 3.3V; The D1 pin of former limit transformer H bridge driver IC2 and D2 pin feed back to the VCC pin of IC2 respectively through diode D3 and D4; Be two input ends of transformer TR1 primary coil are connected to former limit transformer H bridge driver respectively through diode D3, a D4 VCC pin, also through a filter capacitor C10 ground connection, filter capacitor C10's public output of diode D3 and D4 strobes.
The startup WV of former limit transformer H bridge driver IC2 itself only needs 2.5V; But continuous firing then need be given the following WV of above 7V of 4.5V of VCC of IC2 after starting; Therefore; If the 3.3V single power supply, then need increase D3, D4 and C10 and utilize transformer TR1 to boost to supply with VCC after the rectification and use.
Fig. 3 is the circuit diagram of data-signal buffer circuit in the hot-swappable RS232 interface circuit of support provided by the invention.As shown in Figure 3, the data-signal buffer circuit comprises the first optocoupler OC1, the second optocoupler OC2 and triode T1.
See also Fig. 3; UART0IN and UART0OUT are respectively the data reception signal (input signal) and the data transmission signals (output signal) of universal asynchronous reception/transmit control device UART one side among the figure, and the TXD232 of RS232 interface end DB9 and RXD232 are respectively that the data reception signal (input signal) and the data of RS232 interface one side of PC or equipment are sent signal (output signal).
The data of RS232 interface end are sent signal RXD232 and are input to the first optocoupler OC1 through the first buffer protection circuit, and first optocoupler OC1 output UART0IN signal is to universal asynchronous reception/transmit control device.The first buffer protection circuit comprises the first safety capacitor C 2, a TVS diode D1, first inductance L 1 and the first diode D9; Be connected with the first diode D9 with first inductance L 1 successively after the first safety capacitor C 2 and the TVS diode parallel connection; The first diode D9 connects successively and is connected to the P pin of the first optocoupler OC1 behind two current-limiting resistance R6, the R7; The N pin warp second diode D10 of the first optocoupler OC1 connects the output terminal of the first diode D9, and the VCC pin of the first optocoupler OC1 connects 3.3V voltage, and UART0IN is the data reception signal of universal asynchronous reception/transmit control device UART; UART0IN connects the VO pin of the first optocoupler OC1; The data of RS232 interface end are sent signal RXD232 after the first optocoupler OC1 isolates, and are converted into the UART0IN of LVTTL logic level, the function of conversion of completion logic level and insulation blocking.Wherein, the effect of the first safety capacitor C 2, a TVS diode D1 and first inductance L 1 is surge current and the higher oscillating voltage of amplitude that is prone to when suppressing the plug of RS232 interface, and the effect of the first diode D9 is a function of utilizing it oppositely to end; The serial ports of protection PC side or equipment side, as do not have D9 is when PC side or equipment side are logic high; Voltage far below G; Can produce bigger electric current, have D9 oppositely to end, the electric current of generation is just very little.The second diode D10 plays the reverse voltage clamper, as does not have D10, and then reverse voltage is too high, can damage the light emitting diode of OC1.Current-limiting resistance resistance R 6, R7 play current limliting and thermolysis.
The data of UART are sent the N pin that signal UART0OUT meets the second optocoupler OC2; The P pin of the second optocoupler OC2 connects the 3.3V voltage source of UART side through resistance R 10; The VCC of the second optocoupler OC2 and VO pin are connected in series the base stage that meets triode T1 after pull-up resistor R8 and the current-limiting protection resistance R 9 respectively; The emitter of triode T1 meets the P9V of power isolation circuit output; Export the RS232 interface from the data reception signal TXD232 of the RS232 interface end of the collector of triode T1 output to through the second buffer protection circuit, final UART0OUT is converted into the data of RS232 interface and sends signal TXD232.The second buffer protection circuit comprises the second safety capacitor C 3, the 2nd TVS diode D2 and second inductance L 2; Be connected with second inductance L 2 after the second safety capacitor C 3 and the 2nd TVS diode D2 parallel connection; Second inductance L 2 is connected with the collector of triode T1; The N9V of power isolation circuit output connects the collector of triode T1 through drop-down shunt resistance circuit, and drop-down shunt resistance circuit is composed in parallel by first, second drop-down current-limiting resistance R3, R4.
The second optocoupler OC2 plays two effects: the one, the LVTTL logic level of UART and the logic level of RS232 are isolated and conversion; The 2nd, play the plug protective effect.The effect of triode T1 is a signals reverse, and this is that the withstand voltage and anti-flow valuve of triode T1 is all bigger simultaneously, strengthens hot-swappable protective capability because the logic level of RS232 is an antilogical.First, second drop-down current-limiting resistance R3, R4 are used for shunting and dispelling the heat.
The present invention has adopted high speed photo coupling, and serial ports speed can reach 115200bps, satisfies the serial ports rate requirement in the present Embedded System Design.Because overcurrent that transformer and high speed photo coupling bear and overvoltage impact capacity are also more intense, so whole Interface design possesses the hot-swappable ability of support.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structural change of under enlightenment of the present invention, making, and every have identical or close technical scheme with the present invention, all falls within protection scope of the present invention.
Claims (7)
1. support hot-swappable RS232 interface circuit, it is characterized in that, comprise power isolation circuit and data-signal buffer circuit;
Said power isolation circuit comprises current limiting load switch, former limit transformer H bridge driver, transformer and current rectifying and wave filtering circuit; Power supply is input to former limit transformer H bridge driver after the current limiting load switch current limliting; Said former limit transformer H bridge driver driving transformer boost into the corresponding alternating voltage of RS232 interface level, by the current rectifying and wave filtering circuit rectification be then and the output of the corresponding P9V of RS232 interface level and N9V direct voltage source;
Said data-signal buffer circuit comprises first optocoupler, second optocoupler and triode; The data of RS232 interface end are sent signal RXD232 and are input to first optocoupler through the first buffer protection circuit, and first optocoupler output UART0IN signal is to universal asynchronous reception/transmit control device; The data of universal asynchronous reception/transmit control device are sent signal UART0OUT and are input to second optocoupler; The output signal of second optocoupler is connected to the base stage of triode through pull-up resistor; The emitter of triode meets the P9V of power isolation circuit output; The N9V of power isolation circuit output is connected to the collector of triode through drop-down shunt resistance circuit, exports the RS232 interface from the data reception signal TXD232 of the RS232 interface end of the collector output of triode to through the second buffer protection circuit.
2. the RS232 interface circuit that support as claimed in claim 1 is hot-swappable; It is characterized in that; The said first buffer protection circuit comprises the first safety electric capacity, a TVS diode, first inductance and first diode; Be connected with first diode with first inductance successively after first electric capacity and the TVS diode parallel connection, first diode, two current-limiting resistances of connecting successively are connected to the P pin of first optocoupler, and the N pin of first optocoupler connects the output terminal of first diode through second diode; The said second buffer protection circuit comprises the second safety electric capacity, the 2nd TVS diode and second inductance, is connected with second inductance after second electric capacity and the 2nd TVS diode parallel connection, and second inductance is connected with the collector of triode.
3. the RS232 interface circuit that support as claimed in claim 1 is hot-swappable is characterized in that, said drop-down shunt resistance circuit is composed in parallel by first, second drop-down shunt resistance.
4. the RS232 interface circuit that support as claimed in claim 1 is hot-swappable; It is characterized in that; The input voltage of said power isolation circuit is direct current 5V, and the model of current limiting load switch is TPS22941DCKR, and the model of former limit transformer H bridge driver is MAX253CSA+; The Vin pin of current limiting load switch is connected with said input voltage; The Vout pin connects the VCC pin of former limit transformer H bridge driver and the center tap of transformer TR1, and the input end of transformer TR1 primary coil connects D1, the D2 pin of former limit transformer H bridge driver respectively, the output termination current rectifying and wave filtering circuit of the secondary coil of transformer TR1.
5. the RS232 interface circuit that support as claimed in claim 1 is hot-swappable; It is characterized in that; The input voltage of said power isolation circuit is direct current 3.3V; The model of current limiting load switch is TPS22941DCKR, and the model of former limit transformer H bridge driver is MAX253CSA+, and the Vin pin of current limiting load switch is connected with said input voltage; The Vout pin connects the VCC pin of former limit transformer H bridge driver and the center tap of transformer TR1; The input end of transformer TR1 primary coil connects D1, the D2 pin of former limit transformer H bridge driver respectively, the output termination current rectifying and wave filtering circuit of the secondary coil of transformer TR1, two input ends of transformer respectively through a diode be connected to former limit transformer H bridge driver the VCC pin.
6. like claim 4 or the hot-swappable RS232 interface circuit of 5 described supports, it is characterized in that power end safety electric capacity of parallel connection on the said input voltage.
7. the RS232 interface circuit that support as claimed in claim 5 is hot-swappable is characterized in that, the public output of two said diodes is through a filter capacitor ground connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210188686.2A CN102760113B (en) | 2012-06-08 | 2012-06-08 | RS232 interface circuit with hotplug support |
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| CN201210188686.2A CN102760113B (en) | 2012-06-08 | 2012-06-08 | RS232 interface circuit with hotplug support |
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| CN102760113B CN102760113B (en) | 2015-07-15 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107861899A (en) * | 2017-11-21 | 2018-03-30 | 盛科网络（苏州）有限公司 | A kind of serial line interface |
| CN108322209A (en) * | 2018-03-29 | 2018-07-24 | 大连大铁通益科技有限公司 | A kind of digital signal interface circuit and industrial equipment |
| CN108923179A (en) * | 2018-08-29 | 2018-11-30 | 深圳圣诺医疗设备股份有限公司 | The hot-swappable infusion work station of one kind and infusion system |
| CN109144929A (en) * | 2018-08-30 | 2019-01-04 | 西北工业大学 | A kind of RS232 communication interface circuit for supporting hot plug |
| CN111382101A (en) * | 2018-12-28 | 2020-07-07 | 深圳市优必选科技有限公司 | Communication bus circuit, communication bus and master-slave communication system |
| CN111884611A (en) * | 2020-08-10 | 2020-11-03 | 四川众航电子科技有限公司 | Double-isolation power amplifier circuit |
| WO2022120637A1 (en) * | 2020-12-09 | 2022-06-16 | Astec International Limited | Low loss snubber circuit |
| CN114938316A (en) * | 2022-05-20 | 2022-08-23 | 淮安威灵电机制造有限公司 | Isolated asynchronous communication circuit and method of household appliance and household appliance |
| CN118075411A (en) * | 2024-04-17 | 2024-05-24 | 深圳市玩视科技股份有限公司 | EARC switching circuit |
| CN108923179B (en) * | 2018-08-29 | 2024-06-28 | 深圳圣诺医疗设备股份有限公司 | But hot plug infusion workstation and infusion system |
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| CN101178699A (en) * | 2007-11-26 | 2008-05-14 | 中兴通讯股份有限公司 | Hot-swap method and device supporting serial management interface |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107861899A (en) * | 2017-11-21 | 2018-03-30 | 盛科网络（苏州）有限公司 | A kind of serial line interface |
| CN108322209B (en) * | 2018-03-29 | 2023-09-08 | 大连大铁通益科技有限公司 | Digital signal interface circuit and industrial equipment |
| CN108322209A (en) * | 2018-03-29 | 2018-07-24 | 大连大铁通益科技有限公司 | A kind of digital signal interface circuit and industrial equipment |
| CN108923179A (en) * | 2018-08-29 | 2018-11-30 | 深圳圣诺医疗设备股份有限公司 | The hot-swappable infusion work station of one kind and infusion system |
| CN108923179B (en) * | 2018-08-29 | 2024-06-28 | 深圳圣诺医疗设备股份有限公司 | But hot plug infusion workstation and infusion system |
| CN109144929A (en) * | 2018-08-30 | 2019-01-04 | 西北工业大学 | A kind of RS232 communication interface circuit for supporting hot plug |
| CN109144929B (en) * | 2018-08-30 | 2022-04-05 | 西北工业大学 | RS232 communication interface circuit supporting hot plug |
| CN111382101A (en) * | 2018-12-28 | 2020-07-07 | 深圳市优必选科技有限公司 | Communication bus circuit, communication bus and master-slave communication system |
| CN111382101B (en) * | 2018-12-28 | 2021-06-04 | 深圳市优必选科技有限公司 | Communication bus circuit, communication bus and master-slave communication system |
| CN111884611B (en) * | 2020-08-10 | 2024-01-30 | 四川众航电子科技有限公司 | Dual-isolation power amplifier circuit |
| CN111884611A (en) * | 2020-08-10 | 2020-11-03 | 四川众航电子科技有限公司 | Double-isolation power amplifier circuit |
| WO2022120637A1 (en) * | 2020-12-09 | 2022-06-16 | Astec International Limited | Low loss snubber circuit |
| CN114938316A (en) * | 2022-05-20 | 2022-08-23 | 淮安威灵电机制造有限公司 | Isolated asynchronous communication circuit and method of household appliance and household appliance |
| CN114938316B (en) * | 2022-05-20 | 2023-09-22 | 淮安威灵电机制造有限公司 | Isolation asynchronous communication circuit and method of household appliance and household appliance |
| CN118075411A (en) * | 2024-04-17 | 2024-05-24 | 深圳市玩视科技股份有限公司 | EARC switching circuit |
| CN118075411B (en) * | 2024-04-17 | 2024-07-05 | 深圳市玩视科技股份有限公司 | EARC switching circuit |
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| CN102760113B (en) | 2015-07-15 |
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